{"id":6289,"date":"2026-10-19T09:48:44","date_gmt":"2026-10-19T09:48:44","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-efnafraedi-mariia-potkina\/"},"modified":"2026-10-19T09:48:44","modified_gmt":"2026-10-19T09:48:44","slug":"doktorsvorn-i-efnafraedi-mariia-potkina","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-efnafraedi-mariia-potkina\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed efnafr\u00e6\u00f0i &#8211; Mariia Potkina"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><a href=\"https:\/\/livestream.com\/hi\/doktorsvornmariiapotkina\">Streymi<\/a><br \/><strong><\/strong><\/p>\n<p><strong>Doktorsefni: <\/strong>Mariia Potkina<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong> St\u00f6\u00f0ugleiki og t\u00edmaframvinda hendinna segul\u00e1standa \u00ed sam- og andseglandi efnum (Stability and dynamics of chiral magnetic structures in ferro- and antiferromagnets)<\/p>\n<p><strong>Andm\u00e6lendur:<br \/> <\/strong>Dr. G\u00edsli H\u00f3lmar J\u00f3hannesson, svi\u00f0sstj\u00f3ri st\u00e6r\u00f0fr\u00e6\u00f0i og raunv\u00edsinda hj\u00e1 Keili<br \/> Dr. Sergei A. Egorov, pr\u00f3fessor vi\u00f0 University of Virginia,\u00a0 Bandar\u00edkjunum<\/p>\n<p><strong>Lei\u00f0beinandi:<\/strong> Dr. Hannes J\u00f3nsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00cd<\/p>\n<p><strong>Einnig \u00ed doktorsnefnd: <\/strong>Dr. Valery M. Uzdin, pr\u00f3fessor vi\u00f0 ITMO h\u00e1sk\u00f3lann \u00ed St. P\u00e9tursborg, R\u00fasslandi<br \/> Dr. Pavel F. Bessarab, s\u00e9rfr\u00e6\u00f0ingur vi\u00f0 Raunv\u00edsindastofnun H\u00e1sk\u00f3lans<\/p>\n<p><strong>Doktorsv<\/strong><strong>\u00f6<\/strong><strong>rn st\u00fdrir:<\/strong> Dr. Oddur Ing\u00f3lfsson, pr\u00f3fessor og varadeildarforseti Raunv\u00edsindadeildar H\u00cd<\/p>\n<p><strong>\u00c1<\/strong><strong>grip<\/strong><\/p>\n<p>Sm\u00e6kkun seguleininga fyrir gagnageymslu, flutning og \u00farvinnslu uppl\u00fdsinga ni\u00f0ur \u00ed nan\u00f3skala myndi leggja grunninn a\u00f0 miklum framf\u00f6rum \u00ed uppl\u00fdsingat\u00e6kni, b\u00e6\u00f0i hva\u00f0 var\u00f0ar hra\u00f0a og orkunotkun. Sl\u00edk \u00fer\u00f3un krefst greiningar \u00e1 st\u00f6\u00f0ugleika sta\u00f0bundinna segul\u00e1standa me\u00f0 tilliti til varmaorku og tilviljunarkenndra utana\u00f0komandi \u00e1hrifa. \u00cd ritger\u00f0inni eru \u00feessi atri\u00f0i ranns\u00f6ku\u00f0 me\u00f0 \u00fev\u00ed a\u00f0 nota virkjunar\u00e1standskenninguna innan kj\u00f6rsveifilsn\u00e1lgunarinnar. L\u00edft\u00edmi skyrmeinda er reikna\u00f0ur \u00fat fyrir \u00fdmis gildi \u00e1 hlutfallinu milli grindarfastans og st\u00e6r\u00f0ar skyrmeindarinnar. Orku\u00fer\u00f6skuldurinn fyrir ey\u00f0ingu skyrmeindar n\u00e1lgast Belavin-Polyakov ne\u00f0ri m\u00f6rk \u00e1 orku stakeindar \u00ed sigma-l\u00edkaninu og \u00f3rei\u00f0uframlagi\u00f0 til forveldisstu\u00f0ulsins \u00ed Arrhenius l\u00edkingunni stefnir \u00e1 fasta. L\u00edft\u00edmi skyrmeindar getur \u00fear af lei\u00f0andi veri\u00f0 n\u00e6gjanlega langur vi\u00f0 stofuhita ef h\u00fan samanstendur af n\u00e6gjanlega st\u00f3rum fj\u00f6lda spuna, jafnvel \u00fe\u00f3tt tv\u00edskauts-tv\u00edskauts v\u00edxlverkun s\u00e9 ekki tekin me\u00f0 \u00ed reikninginn. Ger\u00f0ir eru \u00fatreikningar \u00e1 skyrmeindum \u00ed andseglandi efnum og eiginleikar \u00feeirra bornir saman vi\u00f0 skyrmeindir \u00ed samseglandi efnum. Hra\u00f0afastinn fyrir ey\u00f0ingu skyrmeindar inni \u00ed efninu, sem og brotthvarf skyrmeindar \u00ed gegnum ja\u00f0ra segulefnisins og binding vi\u00f0 \u00f3seglandi \u00f3hreinindi, er reikna\u00f0ur sem fall af \u00e1l\u00f6g\u00f0u segulsvi\u00f0i. L\u00edft\u00edmi andskyrmeinda vi\u00f0 stofuhita \u00ed Mn\u2013Pt\u2013Sn Heusler efni hefur veri\u00f0 reikna\u00f0ur \u00fat me\u00f0 \u00fev\u00ed a\u00f0 nota at\u00f3mskalal\u00edkan sem inniheldur allt a\u00f0 millj\u00f3n spuna. Ni\u00f0urst\u00f6\u00f0ur reikninganna s\u00fdna a\u00f0 s\u00e1 langi l\u00edft\u00edmi sem hefur veri\u00f0 \u00e1kvar\u00f0a\u00f0ur me\u00f0 m\u00e6lingum \u00e1 tilraunastofu stafar af h\u00e1rri virkjunarorku frekar en entr\u00f3p\u00edu\u00e1hrifum \u00ed \u00feessu kerfi. Eiginleikar andskyrmeinda \u00ed samseglandi og andseglandi \u00feunnum h\u00fa\u00f0um eru greindir me\u00f0 v\u00f6rpun \u00e1 spunavigrum og \u00fatv\u00edkku\u00f0um Heisenberg Hamilton virkja. Au\u00f0velt er a\u00f0 bera saman f\u00e6rslueiginleika, sem og varmafr\u00e6\u00f0ilegan st\u00f6\u00f0ugleika andskyrmeinda og samsvarandi skyrmeinda me\u00f0 \u00feessari v\u00f6rpun.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Mariia Potkina f\u00e6ddist \u00ed Sankti P\u00e9tursborg \u00ed R\u00fasslandi \u00e1ri\u00f0 1993 og \u00f3lst upp \u00ed Len\u00edngrad-h\u00e9ra\u00f0i. H\u00fan l\u00e6r\u00f0i kennilega e\u00f0lisfr\u00e6\u00f0i \u00ed St. Petersburg State University \u00fear sem h\u00fan lauk BA- og meistaragr\u00e1\u00f0u. \u00c1ri\u00f0 2017 h\u00f3f h\u00fan doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands \u00fear sem h\u00fan hefur rannsaka\u00f0 st\u00f6\u00f0ugleika hendinna segul\u00e1standa fyrir gagnageymslu. \u00cd fr\u00edt\u00edma s\u00ednum n\u00fdtur h\u00fan \u00feess a\u00f0 l\u00e6ra taugav\u00edsindi og tungum\u00e1l og stunda sund.<\/p>\n<p>\u00a0<\/p>\n<\/div><\/div>","protected":false},"featured_media":5149,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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